Sol-gel deposition of TiO2/PMMA bilayer with the Optical and Antireflection Properties

Yudoyono, Gatut; Sudarsono, Sudarsono; Puspitasari, Nurrisma; Prajitno, Gontjang; Sunarno, Hasto; Rohedi, Ali Yunus; Pramono, Yono Hadi; Zainuri, Mochamad; Darminto, Darminto

doi:10.1088/1742-6596/1153/1/012079

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“…Organic coatings have been extensively applied for protecting metallic substrates to retard the corrosion degradation in different media [10]. Among the organic coatings, the polyacrylates are interesting due to their properties, in particular the poly(methyl methacrylate) (PMMA) [5,6,11] Among various polyesters substrates, PMMA is still the main thermoplastic material used for diverse applications, such as optoelectronics, aeronautic, dentistry, microfluidic, household, military and many more engineering and industrial applications/purposes, since it possesses excellent weatherability, good transparency, high impact resistance (hardness), antireflective, low birefringence good processability (acrylic group can be hardened by heat and light when used as film) and also has compatible potential for being used with the organic matrix [12,13,14,15,16,17]. However, the application is limited due to its low corrosion resistance and thermal degradation.…”

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confidence: 99%

Electrochemical Study of a Hybrid Polymethyl Methacrylate Coating using SiO2 Nanoparticles toward the Mitigation of the Corrosion in Marine Environments

et al. 2019

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The demand for hydrophobic polymer-based protective coatings to impart high corrosion resistance has increased recently. The increase of the hydrophobicity in a hybrid coating is a new challenge, for that reason and in order to protect a metallic surface of oxidant agents, a poly (methyl methacrylate) (PMMA) coating with the addition of a different amount of silicon dioxide (SiO2) was developed. The hybrid coating was applied on a sample of stainless steel AISI 304 by the dip-coating method. The characterization of the coatings was determined by electrochemical impedance spectroscopy and with a scanning electrochemical microscopy. The best coatings were PMMA and PMMA + SiO2 0.01% that exhibits a real impedance in the Nyquist diagram of 760 and 427,800 MΩ⋅cm2, respectively, and the modulus of the real impedance in the Bode diagram present values of 2.2 × 108 and 3.3 × 108 Ω⋅cm2. Moreover, the phase angle presents constant values around 75° to 85° and 85° for the PMMA and PMMA + SiO2 0.01%, respectively. Moreover, the values of the real resistance for the PMMA + SiO2 0.01% coating present values in the order of Mega-ohms despite the coating exhibits an artificial defect in their surface. The contact angle test showed that the hydrophobicity of the hybrid PMMA + SiO2 0.01% coating is higher than that of the pure PMMA coatings. The hybrid PMMA + SiO2 coatings developed in this work are a very interesting and promising area of study in order to develop efficient products to protect metallic surfaces from corrosion phenomenon.

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